usart1 与usart2同时使用定义的 代码

要同时使用USART1和USART2，您需要先在代码中初始化这两个USART，并为它们分配不同的缓冲区。以下是一个简单的示例代码：

#include "stm32f4xx.h"
#include <stdio.h>

#define USART1_BUFFER_SIZE 128
#define USART2_BUFFER_SIZE 256

char usart1_buffer[USART1_BUFFER_SIZE];
char usart2_buffer[USART2_BUFFER_SIZE];

void init_usart1(void) {
    // 初始化USART1
    USART_InitTypeDef USART_InitStruct;
    USART_InitStruct.USART_BaudRate = 115200;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStruct);
    
    // 启用USART1的中断
    NVIC_InitTypeDef NVIC_InitStruct;
    NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);
    
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    
    // 启用USART1
    USART_Cmd(USART1, ENABLE);
}

void init_usart2(void) {
    // 初始化USART2
    USART_InitTypeDef USART_InitStruct;
    USART_InitStruct.USART_BaudRate = 9600;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART2, &USART_InitStruct);
    
    // 启用USART2的中断
    NVIC_InitTypeDef NVIC_InitStruct;
    NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);
    
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    
    // 启用USART2
    USART_Cmd(USART2, ENABLE);
}

int main(void) {
    // 初始化USART1和USART2
    init_usart1();
    init_usart2();
    
    while(1) {
        // 在这里可以加入其他代码
    }
}

void USART1_IRQHandler(void) {
    static uint16_t usart1_rx_index = 0;
    
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
        // 读取USART1接收到的数据，并存储到缓冲区中
        char data = USART_ReceiveData(USART1);
        usart1_buffer[usart1_rx_index] = data;
        usart1_rx_index++;
        if(usart1_rx_index >= USART1_BUFFER_SIZE) {
            usart1_rx_index = 0;
        }
    }
}

void USART2_IRQHandler(void) {
    static uint16_t usart2_rx_index = 0;
    
    if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) {
        // 读取USART2接收到的数据，并存储到缓冲区中
        char data = USART_ReceiveData(USART2);
        usart2_buffer[usart2_rx_index] = data;
        usart2_rx_index++;
        if(usart2_rx_index >= USART2_BUFFER_SIZE) {
            usart2_rx_index = 0;
        }
    }
}

在上面的代码中，我们初始化了USART1和USART2，并为它们分别分配了128字节和256字节的缓冲区。我们还启用了两个USART的中断，并在接收到数据时将其存储到相应的缓冲区中。在主循环中，您可以添加其他代码来处理缓冲区中的数据。